I asked this question because I was about to start ordering parts for a 9mm build.
I ordered a 10mm lower instead.
Thank you again for your time.
That sounds like a great idea. Which one did you get?
I asked this question because I was about to start ordering parts for a 9mm build.
I ordered a 10mm lower instead.
Thank you again for your time.
Quarter Circle 10.That sounds like a great idea. Which one did you get?
Seems like blowback is only option but I am going to look around for options before I buy the upper/barrel/bolt.
The upper and lower are the same as for 223. The barrel is not going to blow with a little extra pressure.
I figgered a 230 gr. bullet at bout 1,000-1,100 fps from a 45 ACP will do quite well...
ok, now I have to ask, what .45acp gun and load is giving you a 230gr at 1,000-1,100fps???
inquiring minds want to know...
1000 fps is not difficult with the right powder, even at standard operating pressure.
https://www.shootingtimes.com/editor...e-45-acp/99214
My load of CFE for Pistol under a RMR 230 FMJ, and not max, will give me that velocity in my pistol caliber carbine. We were talking about a pistol caliber carbine, weren't we?ok, now I have to ask, what .45acp gun and load is giving you a 230gr at 1,000-1,100fps???
inquiring minds want to know...
The recoil calculation is off, too. QuickLOAD puts it at a whopping 15 ft-lbs and change. I don't think the author used correct muzzle gas velocity. By way of comparison, a 9 lb rifle in 30-06 firing a 150-grain bullet at 2870 fps using IMR4320 has that same recoil energy. Great fun one-handed, I expect.
Plus, the author of that article is not good with numbers. He's claiming that going from a load of 13.0 grains to 14.2 grains will increase velocity 10.3% and pressure by only about 6%. So either he has harnessed free energy or he's way off. Basically, with the same 5" standard 45 Auto test barrel length, the dead minimum the pressure will increase is as the square of the ratio of the velocities, which would put it at 22,485 psi. It goes up in proportion to the square of velocity because when you double velocity you halve the barrel time, to the pressure has to accelerate the bullet to twice the velocity in half the time, and that takes four times as much pressure, and four is the square of two. But that simple calculation assumes the ratio of the peak pressure to the muzzle pressure is constant, but in reality, peak pressure climbs faster than muzzle pressure. QuickLOAD, after adjusting the powder parameters and seating depth to meet Ramshot's measured pressure and velocity, and then raising the charge weight to 14.2 grains, does, in fact, come very close to 1078 fps (it gets 1083 fps), and puts the pressure at 23,957 psi. That's probably about right.
I considered a 9mm carbine, but after some thought I figgered a 230 gr. bullet at bout 1,000-1,100 fps from a 45 ACP will do quite well...
. We were talking about a pistol caliber carbine, weren't we?